40 lines
854 B
Go
40 lines
854 B
Go
// Copyright (C) MongoDB, Inc. 2023-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package ptrutil
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// CompareInt64 is a piecewise function with the following return conditions:
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//
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// (1) 2, ptr1 != nil AND ptr2 == nil
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// (2) 1, *ptr1 > *ptr2
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// (3) 0, ptr1 == ptr2 or *ptr1 == *ptr2
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// (4) -1, *ptr1 < *ptr2
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// (5) -2, ptr1 == nil AND ptr2 != nil
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func CompareInt64(ptr1, ptr2 *int64) int {
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if ptr1 == ptr2 {
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// This will catch the double nil or same-pointer cases.
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return 0
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}
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if ptr1 == nil && ptr2 != nil {
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return -2
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}
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if ptr1 != nil && ptr2 == nil {
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return 2
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}
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if *ptr1 > *ptr2 {
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return 1
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}
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if *ptr1 < *ptr2 {
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return -1
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}
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return 0
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}
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